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Cisco 640-821 Dumps

Cisco
Introduction to Cisco Networking Technologies (INTRO)
Cisco
Introduction to Cisco Networking Technologies (INTRO)

Questions & Answers for Cisco 640-821

Showing 1-15 of 92 Questions

Question #1 - Topic 0

Which two statements describe the operation of the CSMA/CD access method? (Choose
two.)

A. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.

B. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting.

C. The use of hubs to enlarge the size of collision domains is one way to improve the operation of the CSMA/CD access method.

D. After a collision, the station that detected the collision has first priority to resend the lost data.

E. After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations have equal priority to transmit data.

F. After a collision, all stations involved run an identical backoff algorithm and then synchronize with each other prior to transmitting data.

Question #2 - Topic 0

Which of the following commands displays the configurable parameters and statistics of all
interfaces on a router?

A. show running-config

B. show startup-config

C. show interfaces

D. show processes

E. show versions

Question #3 - Topic 0

After the shutdown command has been issued on the serial 0/0 interface, what will be
displayed when the show interface serial 0/0 command is issued by the administrator?

A. Serial0/0 is administratively down, line protocol is down

B. Serial0/0 is down, line protocol is down

C. Serial0/0 is up, line protocol is down

D. Serial0/0 is administratively down, line protocol is administratively down

E. Serial0/0 is up, line protocol is up

F. Serial0/0 is down, line protocol is up

Question #4 - Topic 0

A network administrator is connecting PC hosts A and B directly through their Ethernet
interfaces as shown in the graphic. Ping attempts between the hosts are unsuccessful.
What can be done to provide connectivity between the hosts? (Choose two.)

A. A crossover cable should be used in place of the straight-through cable.

B. A rollover cable should be used in place of the straight-through cable

C. The subnet masks should be set to 255.255.255.192.

D. A default gateway needs to be set on each host.

E. The hosts must be reconfigured to use private IP addresses for direct connections of this type.

F. The subnet masks should be set to 255.255.255.0.

Question #5 - Topic 0

What is the difference between the Cisco router IOS commands show cdp neighbor detail
and show cdp entry?

A. The show cdp neighbor detail command shows all neighbor information, while show cdp entry displays only one line of output for each neighbor.

B. The show cdp entry command shows neighbor information for specific neighbors only, while show cdp neighbor detail lists each neighbor with detailed output on each.

C. The show cdp entry command shows neighbor information for all neighbors with one line of output for each, while show cdp neighbor detail lists each neighbor with detailed output on each.

D. The show cdp neighbor detail command shows neighbor information for a single neighbor only, while show cdp entry displays detailed output on each neighbor known.

Question #6 - Topic 0

How will a Cisco 2600 series router respond if the conditions listed below exist during the
boot process?
1) The IOS image in flash is missing.
2) No network connectivity is available.
3) The router fallback IOS image is corrupt.

A. The router will enter setup mode.

B. The router will enter ROM monitor mode.

C. The router will enter global configuration mode.

D. The boot will hang until an IOS is available.

E. The router will enter the prompted setup dialog.

Question #7 - Topic 0

Which types of cables are required to interconnect the devices shown in the graphic?
(Choose three.)

A. V.35 cable

B. crossover cable

C. USB cable

D. RJ-11 cable

E. rollover cable

F. straight-through cable

Question #8 - Topic 0

An administrator issues the show ip interface s0/0 command and the output displays the
line Serial0/0 is up, line protocol is upWhat does "line protocol is up" specifically indicate
about the interface?

A. Keepalives are being received on the interface.

B. The cable is attached properly.

C. CDP has discovered the connected device.

D. A carrier detect signal has been received from the connected device.

E. IP is correctly configured on the interface.

Question #9 - Topic 0

Refer to the exhibit. What is needed to allow host A to ping host B?

A. a straight-through cable connecting the switches

B. a crossover cable connecting the switches

C. a router connected to the switches with straight-through cables

D. a CSU/DSU connected to the switches with straight-through cables

E. a backbone switch connecting the switches with either fiber optic or straight-through cables

Question #10 - Topic 0

Which statements accurately describe CDP? (Choose three.)

A. CDP is an IEEE standard protocol.

B. CDP is a Cisco proprietary protocol.

C. CDP is a datalink layer protocol.

D. CDP is a network layer protocol.

E. CDP can discover directly connected neighboring Cisco devices.

F. CDP can discover Cisco devices that are not directly connected.

Question #11 - Topic 0

What is the subnet address for the IP address 172.19.20.23/28?

A. 172.19.20.0

B. 172.19.20.15

C. 172.19.20.16

D. 172.19.20.20

E. 172.19.20.32

Question #12 - Topic 0

If a host on a network has the address 172.16.45.14/30, what is the address of the
subnetwork to which this host belongs?

A. 172.16.45.0

B. 172.16.45.4

C. 172.16.45.8

D. 172.16.45.12

E. 172.16.45.16

Question #13 - Topic 0

WAN data link encapsulation types include which of the following? (Choose two.)

A. T1

B. Frame Relay

C. DSL

D. PPP

E. ISDN

Question #14 - Topic 0

drag drop

Question #15 - Topic 0

lab





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